018. Read the following Paragraph and answer the following:
Bohr’s periodic table has seven horizontal rows called periods and sixteen
vertical columns called groups (1 to 16). Alternatively, the elements of the
Bohr’s table are divided into four blocks namely s-, p-, d-, and f- blocks. Group,
period and block of a given element can be predicted with the help of its
electronic configuration.
a. The principal quantum of the valence shell refers to period of the element.
b. The nature of the subshell (s, p or d) having last electron refers the block to
which the element belongs.
c. The number of electrons present in the outermost or penultimate shell predicts
the group of elements.
d. For s-block, the group number =No. of valence electrons
e. For p-block, the group number =10 + Total number of electrons
f. For d-block, the group number =2 + No. of (n – 1) d electrons
Answer the following questions:
1. An element of atomic number 36 belongsto-
(A) 3rd period and p-block
(B) 4th period and p-block
(C) 4th period and s-block
(D) 3rd period and d-block
2. An element with atomic number 58 belongs to-
(A) s-block (B) p-block (C) d-block (D) f-block
3. An element with atomic number 24 in an example of-
(A) alkali metals (B) alkaline earth metals (C) inert gases
(D) transition elements
4. The number of d-series is-
(A) one (B) two (C) three. (D) four
5. The number of electrons present in the outermost shell predicts-
(A) Period Number (B) Group Number
(C ) Shell (D) both period and group number
PLEASE ANSWER CORRECTLY. WRNG ANSWERS AND SPAMMERS WILL BE REPORTED
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element with atomic number 12 is magnesium.
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6 ,3s
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6 ,3s 2
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6 ,3s 2 .
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6 ,3s 2 .There are 2 electrons in the outermost shell so it belongs to the IIA group. Mg has an outermost shell, n =3, therefore, the third period.
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6 ,3s 2 .There are 2 electrons in the outermost shell so it belongs to the IIA group. Mg has an outermost shell, n =3, therefore, the third period.Hence, the correct option is C.
element with atomic number 12 is magnesium.The electronic configuration for Mg= 1s 2 ,2s 2 2p 6 ,3s 2 .There are 2 electrons in the outermost shell so it belongs to the IIA group. Mg has an outermost shell, n =3, therefore, the third period.Hence, the correct option is C.Answered By
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